Seiko Instruments Inc

Takashi Kohata

Takayoshi Hanami

Shinichi Idomukai

Jun Miyanoiri

Tomoyuki Nakaue

Teruyuki Iwashima

Provided are a voltage application time period measuring circuit which does not require a battery, and a power supply apparatus including the voltage application time period measuring circuit. Each of a voltage application time period memory () and a set time period memory () is a nonvolatile memory, and hence it is unnecessary to provide a battery for holding information stored in each of the memories in the outside of the voltage application time period measuring circuit () and a power supply apparatus cost is reduced correspondingly.

Voltage application time period measuring circuit and power supply apparatus including the same

A structure of a liquid crystal device cutting down the power consumption is materialized. In a liquid crystal display device comprising at least two display portions of a dot matrix portion and an icon portion in the same panel, drive is carried out such that both of the display portions are displayed in a normal operation mode and, only the icon portion is displayed in a power-saving operation mode such as when the liquid crystal display device is waiting for operation or is standby. In the power-saving operation mode, the duty ratios of all of the display portions in the power-saving operation mode are lower than those in the normal operation mode, and time shared drive waveforms using the power source voltage as it is which does not require bias voltage are applied.

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Chiba, Japan

Takashi Kohata